Optical notch filter manufacture in optical fibre waveguide by p

Details Optical notch filter manufacture in optical fibre waveguide by p Optical notch filter manufacture in optical fibre waveguide by p

Filed on

1996-04-04

Date issued

1998-01-13

Examiner

Ullah, Akm E.

Patent Class

Optical waveguides

SubClass

With optical coupler

SubSubClass

Particular coupling structure

Other Related Categories

G02B 626, G02B 642

Type

Patent

Status

active

Patent number

057087407

Description

ABSTRACT:
An optical notch filter is created in a bared length of single mode fibre by using a microburner and longitudinal stretching of the fibre to form a set of equispaced sharply localized non-adiabatic biconical tapers at a pitch corresponding to the beat length between the core-guided HE.sub.11 mode and the cladding-guided HE.sub.12 mode, the latter being stripped downstream of the tapers by a plastics protective coating surrounding the fibre.

REFERENCES:
patent: 4701009 (1987-10-01), Tangonan et al.
patent: 4946250 (1990-08-01), Gonthier
patent: 5039190 (1991-08-01), Blonder et al.
patent: 5048909 (1991-09-01), Henry et al.
patent: 5093876 (1992-03-01), Henry et al.
Brophy, "In-Line Singlemode Fibre Interferometer Via Concatenated Biconical Tapers", Electronics Letters, vol. 29, No. 14, Jul. 8, 1993.
Pole, "Two-mode fibre spatial-mode converter using periodic core deformation", Electronics Letters, vol. 30, No. 17, Aug. 18, 1994.

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